Here's why:

* Nonmetals tend to share electrons to form covalent bonds. This sharing creates molecules, which are the building blocks of molecular compounds.

* Metals typically lose electrons to form ionic bonds, resulting in ionic compounds.

Examples of molecular compounds:

* Water (H₂O)

* Carbon dioxide (CO₂)

* Methane (CH₄)

* Ammonia (NH₃)

* Glucose (C₆H₁₂O₆)